.224 in Silicone O-Ring Cord Stock 70A - Red, 10 ft

In this review the.224 in (5.7 mm) silicone O-ring cord stock is examined for practical sealing work where temperature range and chemical resistance matter. The bottom line: this red, 70A durometer silicone cord is best for technicians and hobbyists who need a resilient, heat-tolerant round cord to make custom O-rings or repairs. Its single biggest selling point is the broad usable temperature range combined with silicone's resistance to ozone, weather, detergents and many oils, making it a reliable choice for routine sealing tasks.

Key Features

• Material: Silicone construction provides resilient sealing performance and resistance to ozone and weathering for outdoor or exposed applications.
• Durometer: The 70A hardness balances flexibility and compression set resistance, making it suitable for many static and dynamic seals.
• Temperature range: Rated for wide temperatures, it performs in very cold to very hot environments, which helps reduce material swaps across seasonal or engine-related uses.
• Chemical compatibility: Resists many detergents, salts, engine oils and hydraulic fluids, allowing use in automotive and industrial settings where those fluids are present.
• Made in USA: Domestic manufacture ensures consistent quality and traceable supply for professional users.
• Length and form: Sold as a 10 ft piece with a round cross section, it is convenient for cutting custom O-rings and gaskets on demand.

Who It's For

This O-ring cord is aimed at maintenance technicians, small machine shops, and do-it-yourselfers who need to fabricate or replace O-rings for equipment that sees wide temperature swings or exposure to ozone, detergents and non-petroleum hydraulic fluids. The 70A hardness is versatile for many sealing points where a moderate firmness is required without becoming rigid.

Those who need extreme resistance to aromatic solvents, strong acids or hydrocarbon fuels should look elsewhere, since silicone has known vulnerabilities to certain solvents and prolonged steam exposure above roughly 250 degrees F. Also, applications requiring heavy wear resistance under abrasive motion may favor other elastomers.

Pros & Cons

Pros

• Excellent temperature capability supports use from very low to very high operating temperatures.
• Good resistance to ozone, weather and many oils, useful for outdoor and automotive seals.
• 70A durometer offers a practical balance of flexibility and sealing firmness for custom O-ring fabrication.
• Made in the U.S.A., which typically signals consistent manufacturing quality.

Cons

• Silicone is vulnerable to certain aromatic and chlorinated hydrocarbons, acids, bases and hydrocarbon fuels, limiting use around those chemicals.
• Less durable to mechanical abrasion and prolonged high-pressure steam compared with some other elastomers.

Specifications

Our Verdict

The.224 in silicone O-ring cord stock is a solid value for anyone making custom seals that must withstand broad temperature swings and exposure to ozone, weather and common oils. It is particularly useful in maintenance and repair contexts where consistent, made-in-USA material and a dependable 70A firmness matter. Avoid it where exposure to aromatic solvents, strong acids or heavy abrasion is expected.

Frequently Asked Questions

Can this cord be used to make replacement O-rings?
Yes. The round 0.224 in cross section and 10 ft length make it suitable for cutting and forming custom O-rings for many sealing needs.

What fluids is the silicone resistant to?
It resists ozone, weather, detergents, salt water, engine and transmission oil, non-petroleum brake fluid and certain hydraulic fluids, as well as vegetable and animal oils.

Are there chemicals to avoid?
Avoid aromatic hydrocarbons like benzene, chlorinated solvents, strong acids and bases, hydrocarbon fuels, and prolonged steam above about 250 F.